Oberton 12B400

• Sensitivity (1W, 1m, infinite baffle) SPL1W 97.1dB
• Frequency response 50 - 2500Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 50.5Hz
• Mechanical quality factor QMS 9.69
• Electrical quality factor QES 0.26
• Total quality factor QTS 0.25

Large signal parameters

• Maximum linear excursion xmax 5.3mm
• Air volume displaced at xmax VD 270cm³
• Power handling P 400W
• Program power Pmax 800W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 5.6Ω
• Inductance (1kHz) LE 0.81mH
• VC Diameter 77mm
• Winding height HVC 15mm
• Winding material Aluminium
• Former material Kapton

Magnet

• Flux density B 1.33T
• Force factor Bl 18.4N/A
• Motor constant Bl/√RE 7.81N/√W
• Air gap height HAG 9mm
• Material Ferrite

Diaphragm

• Effective diameter 256mm
• Effective area SD 515cm²
• Moving mass MMS 49.2g
• Moving mass (without air load) MMD 40.8g
• Material Paper

Suspensions

• Stiffness KMS 4.95N/mm
• Compliance CMS 202µm/N
• Equivalent volume to the compliance VAS 74.7L
• Mechanical resistance RMS 1.61N·s/m

Dimensions

• Nominal diameter 12″
• 310mm
• Overall diameter 311mm
• Baffle cutout diameter 280mm
• Overall depth 145mm
• Volume occupied by the driver (estimated) 3L
• Net weight 7.25kg
• Frame material Die cast aluminium